Neck expander die, by Lee, 7/8x14 thread. Neck expander plug separately. Order one of the popular sizes of neck expander plugs or powder compression plugs shown below for use with this die.

The die comes with a factory powder through plug installed. This plug will need to be removed before installing a neck expander plug, or powder compression plug. Unscrew the nut at the top and tip the die body upside down to remove the factory installed plug.

The die comes with a factory powder through plug installed. This plug will need to be removed before installing a neck expander plug, or powder compression plug. Unscrew the nut at the top and tip the die body upside down to remove the factory installed plug.